Relationship between Vds and Vgs- MOSFET The MOSFET acts like a voltage-controlled resistor This region is used for switching Saturation (Vgs > Vt and Vds > Vgs - Vt) -- current flows from drain to source The amount of current is proportional to the square of Vgs, and is (almost) independent of Vds The MOSFET acts like a voltage-controlled current source
How are MOSFET gate capacitances (Cgs, Cgd) calculated? 6 Your equations are approximations to the capacitance seen between G-D and G-S of a mosfet in different regions of operation and they are derived based on the physical characteristics of the mosfet Keep in mind that the physical mosfet is a symmetric device
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